Initial commit for mistral-i18n support

Adding the _i18n.py file to use oslo.i18n libraries in mistral.
Also updating the requirements to support i18n.

Change-Id: I942a4f1b4a65a4a607b284dd44be547ae41642ce
Partial-Implements: blueprint mistral-i18n

mistral/_i18n.py

@@ -0,0 +1,36 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+"""oslo.i18n integration module.
+
+See http://docs.openstack.org/developer/oslo.i18n/usage.html
+
+"""
+
+import oslo_i18n
+
+DOMAIN = 'mistral'
+
+_translators = oslo_i18n.TranslatorFactory(domain=DOMAIN)
+
+# The primary translation function using the well-known name "_"
+_ = _translators.primary
+
+# Translators for log levels.
+#
+# The abbreviated names are meant to reflect the usual use of a short
+# name like '_'. The "L" is for "log" and the other letter comes from
+# the level.
+_LI = _translators.log_info
+_LW = _translators.log_warning
+_LE = _translators.log_error
+_LC = _translators.log_critical

requirements.txt

@@ -15,6 +15,7 @@ networkx>=1.10 # BSD
 oslo.concurrency>=3.8.0 # Apache-2.0
 oslo.config!=3.18.0,>=3.14.0 # Apache-2.0
 oslo.db!=4.13.1,!=4.13.2,>=4.11.0 # Apache-2.0
+oslo.i18n>=2.1.0  # Apache-2.0
 oslo.messaging>=5.2.0 # Apache-2.0
 oslo.middleware>=3.0.0 # Apache-2.0
 oslo.policy>=1.15.0 # Apache-2.0

tox.ini

@@ -67,3 +67,4 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,scripts
 
 [hacking]
 local-check-factory = mistral.hacking.checks.factory
+import_exceptions = mistral._i18n